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Allow multiple HTML _template strings in JS files when running i18n
template replacements. This is necessary to correctly replace
expressions for bundled JS files generated from Polymer 3 pages, as the
bundled files will generally contain many element definitions, each
including HTML template string. This will be used when optimized
Web UI pages are migrated to use Polymer 3/JS modules (e.g.
chrome://extensions).

Bug: 1004967
Change-Id: I9b5990fc26daf272980ee8d4f5aac688aceffb27
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1834846
Commit-Queue: Rebekah Potter <rbpotter@chromium.org>
Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#703031}